package com.ch.fastbuilder.common;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;

@Component
public class SpringContextUtil {
	//private static ApplicationContext beanFactory1 = null;
	//private static ApplicationContext beanFactory2 = null;
	
	private static ApplicationContext applicationContext;
	
	public void setApplicationContext(ApplicationContext appcontext) {
		applicationContext = appcontext;
	}
	
	public ApplicationContext getApplicationContext() {
		return applicationContext;
	}

	/**
	 * 获取对象
	 * 
	 * @param name
	 * @return Object 一个以所给名字注册的bean的实例
	 * @throws BeansException
	 */
	public static Object getBean(String name) throws BeansException {
		/*if(beanFactory1.containsBean(name)) return beanFactory1.getBean(name);
		if(beanFactory2.containsBean(name)) return beanFactory2.getBean(name);
		return null;*/
		return applicationContext.getBean(name);
	}

	/**
	 * 获取类型为requiredType的对象
	 * 如果bean不能被类型转换，相应的异常将会被抛出（BeanNotOfRequiredTypeException）
	 * 
	 * @param name
	 *            bean注册名
	 * @param requiredType
	 *            返回对象类型
	 * @return Object 返回requiredType类型对象
	 * @throws BeansException
	 */
	public static <T> T getBean(String name, Class<T> requiredType)
			throws BeansException {
		/*if(beanFactory1.containsBean(name)) return beanFactory1.getBean(name, requiredType);
		if(beanFactory2.containsBean(name)) return beanFactory2.getBean(name, requiredType);*/
		
		return applicationContext.getBean(name, requiredType);
	}

	/**
	 * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
	 * 
	 * @param name
	 * @return boolean
	 */
	public static boolean containsBean(String name) {
		/*return (beanFactory1.containsBean(name) || beanFactory2.containsBean(name));*/
		return applicationContext.containsBean(name);
	}

	/**
	 * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。
	 * 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
	 * 
	 * @param name
	 * @return boolean
	 * @throws NoSuchBeanDefinitionException
	 */
	public static boolean isSingleton(String name)
			throws NoSuchBeanDefinitionException {
		/*if(beanFactory1.containsBean(name)) return beanFactory1.isSingleton(name);
		if(beanFactory2.containsBean(name)) return beanFactory2.isSingleton(name);
		return false;*/
		
		return applicationContext.isSingleton(name);
	}

	/**
	 * @param name
	 * @return Class 注册对象的类型
	 * @throws NoSuchBeanDefinitionException
	 */
	public static Class getType(String name)
			throws NoSuchBeanDefinitionException {
		/*if(beanFactory1.containsBean(name)) return beanFactory1.getType(name);
		if(beanFactory2.containsBean(name)) return beanFactory2.getType(name);
		return null;*/
		
		return applicationContext.getType(name);
	}

	/**
	 * 如果给定的bean名字在bean定义中有别名，则返回这些别名
	 * 
	 * @param name
	 * @return
	 * @throws NoSuchBeanDefinitionException
	 */
	public static String[] getAliases(String name)
			throws NoSuchBeanDefinitionException {
		/*if(beanFactory1.containsBean(name)) return beanFactory1.getAliases(name);
		if(beanFactory2.containsBean(name)) return beanFactory2.getAliases(name);
		return null;*/
		
		return applicationContext.getAliases(name);
	}
}
